US police release details of Sandy Hook shooting

Adam Lanza shot and killed 27 people, including 20 children and his mother, in the US town of Newtown in December 2012.

ABC: 7.30

The gunman who killed 20 children and six adults at a Connecticut elementary school fired 154 rounds in less than five minutes.

Adam Lanza used 30-round magazines in the massacre at Sandy Hook Elementary School in Newtown - the second-deadliest school shooting in US history.

Connecticut governor Dannel Malloy confirmed the findings after the previously sealed searches of Lanza's car and home were made public.

Police also found a newspaper clipping about a mass shooting in the home that Lanza shared with his mother, along with a gun safe in his bedroom, receipts from shooting ranges and National Rifle Association certificates for both of them.

"We now know that he left the lower capacity magazines at home," Mr Malloy said in a statement.

What police found

• Guns including two rifles, a revolver, a 12-gauge shotgun

• A brown gun safe

• Thousands of rounds of ammunition

• Three Samurai swords and knives

• A bayonet

• NRA membership certificates for Lana and his mother

• A book, "NRA guide to the basics of pistol shooting"

• A gift card addressed to Lanza from his mother for the purchase of a firearm

• Three photographs, including one which investigators believe to be a blood-splattered, dead body

• Seven of Lanza's personal journals

• A New York Times article from February 18, 2008, about a mass school shooting